Recuperative furnace.



WITNESSES 0. HOUSTON. REGUPERATIVE FURNACE. AYPLIUATION FILED FEB. 7, 1914.

2 SHEETS-SHEET 1.

Patented Jan. 26, 1915.

W. O. HOUSTON. RECUPERAT-IVE FURNAGE.

APPLICATION FILED FEB. v, 1914.

1,126,473., Patented $111.26, 1915.

2 SHEETS--SHEET 2.

- 1 BY, 1 l M$MM i .VINVENTDR W7 41 \MTNEESE S';

REC'UFERATIVE FURNACE.

To whom it may concern:

specification.

This invention relates broadly to recu-- perutive furnaces, and specifically to a fun nae-e of a muffle type.

The primary object of the invention is to provide structurally improved muille furnace, primarily designed for bathing enemeled metal were.

A further object is to provide a furnace of the character mentioned in which therecuperator is so arranged With respect to the combustion chamber and furnace proper that access may be had to, either, as for repairs, Without disturbing the other and that neither is required to sustain any pert of the Weight of the other.

is well known, in ordinary types of recuperutive fi'lrnaces, the recuperator is located either under or over the combustion cl iainher.v In either case, the falling in of one portion "frequently necessitates the tearing out of the other in order to repair the injureo portion. Further, the great Weight of the portion sustained ofttirnes causes a. premature collapse of the other portion.

The present invention is directed to a structure wherein the objectionable features noted are obviated.

A still "further object of the invention is to provide. furnace which is especially eflicient for producing the high ternpelntures required in enamelin furnaces with o. inininiiiini of fuel consumption.

"i i ith these and other objects in view, the inventi resides in the features of construction, :1 ngenient of parts and combinations of elements which will hereinafter he full desc ibed, reference being had to the accompanying drawings, forming c pert of this specification, in Whichigure l. is a. transverse sectional view of eiiihodiinent of my invention; 2 is 1 substantially vertical section of the rekitor, taken on the line 2&2, 1; lg. 3 is a horizontal section on the line 3 3, Fi 2.

' Referring to said drawings, in which like designating characters distinguish corre- I Specification of Letters Patent.

.5. .L c, m ml n (a I menieo one, so, role Application filed February '7, leis. Serial 8173M.

snonding' pe rts throughout the severed VIEWS-l indicates the wells of a muffle which is mounted over combustion chamber 3,

the crown :2 of u said rnuiiie being spaced away from the refractory lining 4' of the furnace Wells 5 to form it chamber 6 into which the flames from the burning gases in said combustion chamber hre rected for Wholly enveloping said m n whereby an intense heat imparted to Wells the nnntlle and is ti'ier cby radiated to the interior of said inuiile. Host is p i erahly generated Withinthe comhneciori chamber 3 by means otges burners pieced therein and l shove the ports 53?. iron the top or the chemical" 6 "the WW3 host and products of co ihustion cees' Wa-rd through c suitably located oiienir '5 to a passage or pttsssg'esh hjv which they-ore conducted to the top of e recuperetorfgenr orally designated by the numeral 9, 'zvhic his loco-ted laterally of and is directly connected to one side-Wells 5 of the--' nzice: The rccupcrutor 9 composes opposite,

side-Wells 10 and an end Well 11, it central division Well and o series of tubes 13,

of which will herein he plziined. The products the soss'ege or p." Wes r,

combustion which en vertic 1 r downward to througi nece Wall 5 end the recuperator, to the lower end o perctor, thence through horieoi 15 to and vertically upvs'crd rslity of flu 1 .5 n through the 3e. 1 N which is one said recuperetor. through opposite sidemrclls their said recupsmtor a plurality of sizgier oc horizontal ranged fines T it, the each reconstitute ions t-e- The tuhes l3 dierelr ion longitudinally of the recuperctorsuhst .lly' tween the sidewall-210m he letter, directed through centrel division Wall 12, as is most cleerly shotvn'in 3. tubes are so ends so to term a continuous descending sir llilfi flfie 20. Said tuioes slightly separated and small horizontal puss gcs Eli are provided therehetween efiording communication hetween tines 14 and hetwecn flu h i,

essegcs rough phi J,

more 'fully Suid thus permitting the heated products of combustion passing through said flues l4: and 16 to contact with said tubes 13 on all sides.

As is apparent, much of the heat of the products of combustion escaping through the descending flues 1a and ascending fines 16 is absorbed by the tubes 13 and lines 18 and 19 and is thereby imparted to air which is circulated through the air passages afforded by said tubes and lines. Air is admitted to the upper ends of said passages through a horizontal passage 22 which is open to the atmosphere, as shown in Fig. 1.

and which communicates with all of said passages, as shown in Fig. 2. passes downward through said tortuous pa sages, it becomes heated to a high temperature. From said passages the heated air discharged into a cross-passage 23 from which it is conducted through horizontal flues 24 provided in the bottom oi the :furnace to ascending lines 25, thence to lines 26 located on opposite sides of the combustion chamber 3, from which it issues into the combustion chamber thrhugh a plurality of small ports 27 provided in the side walls of said combustion chamber. Said air enters the combustion chamber in a highly heatetl condition and thus greatly facilitates tlie combustion of gases in said chamber, resulting in a material saving in fuel re- As said air quired to maintain the high temperature of the muiiie.

It claim:

The combination with a furnace, of a recuperator, located laterally thereto, said recuperator comprising side walls and a central wall, superposed horizontally dlsposed fiues formed in the side walls, said central wall consisting of a plurality of vertically spaced tubes, vertical flues disposed upon opposite sides of the central wall and connected at their lower ends by passages, a stack communicating with certain oi said vertical lines for permitting the products of combustion from the furnace to pass to the atmosphere after passing through the spaces between the tubes of the central wall, said tubes being disposed so as to provide a tortuous passage, an air passage communicating with the uppermost tube for supplying external air to the tortuous passage, and to the fines of the side walls, and means for conducting air from tli'esa-id flues and tortuous passage to the combustion chamber of the furnace.

In testimony whereof, I atlix my signature in presence of two subscribing Witnesses.

WILLIAM O. HOUSTON. Witnesses H. E. DUNLAP, W. F. KEEFER. 

